CN103411804B - Heterogeneous body consolidated core model with most permeable zone and preparation method thereof - Google Patents
Heterogeneous body consolidated core model with most permeable zone and preparation method thereof Download PDFInfo
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Abstract
The present invention relates to a kind of heterogeneous body consolidated core model with most permeable zone and preparation method thereof.This core model is the sandwich structure that one deck most permeable zone is clipped between two-layer hypothallus; most permeable zone is mixed with by rock particles, epoxy resin, adjuvant and solid particle of sodium chloride and obtains, and hypothallus is mixed with by rock particles, epoxy resin and adjuvant and obtains.The method for making of this core model comprises: smashed by natural core, grinds to form rock particles; Solid sodium chloride is ground to form solid particle of sodium chloride; Rock particles, epoxy resin and adjuvant are mixed, inserts in mould and prepare hypothallus; Rock particles, epoxy resin, adjuvant and solid particle of sodium chloride are mixed, inserts in mould and form most permeable zone on hypothallus; Rock particles, epoxy resin and adjuvant are mixed, inserts in mould on most permeable zone, form another layer of hypothallus, obtain just base; By compressing for first base, leaves standstill 3 days, obtain core model.
Description
Technical field
The present invention relates to a kind of heterogeneous body consolidated core model with most permeable zone and preparation method thereof, belong to petroleum engineering technical field.
Background technology
Along with going deep into of oil-field development, the comprehensive water cut of China's continental oil fields raises year by year, high-permeability pay water outlet is serious, low permeability pay production potential are difficult to play, and main cause is that long-term high strength water filling causes in the most permeable zone of oil reservoir and defines fluid-channeling channel, inject water and enter producing well along fluid-channeling channel fingering, define inefficient cycle, water percentage rises fast, production declining, and therefore profile control improves injection water section and becomes the task of top priority.
Slow swollen particulate species profile control agent is that a kind of widely used profile control cuts open, to study fully the oil reservoir applicability of profile control agent in laboratory before application at the scene, current experimental technique, no matter be use silica sand loaded with dielectric or use artificial consolidated model, all there is the situation noting not enter, main cause is under reservoir conditions, there is the superelevation pervious course that high strength water filling is formed in immediate vicinity of wellbore, and in laboratory conditions, that consolidated core or silica sand sand pack do not exist superelevation permeable belt, so for the gel particle of slow swollen particulate species after expanding, entrance can only be got lodged in, rock core can not be entered.
Therefore, developing a kind of simple and effective rock core with high permeability zone and preparation method thereof is one of this area problem demanding prompt solution.
Summary of the invention
For solving the problems of the technologies described above, the object of the present invention is to provide a kind of heterogeneous body consolidated core model with most permeable zone and preparation method thereof, the oil reservoir conformability that this core model can be used in improving recovery ratio gel particle can be evaluated.
For achieving the above object; the invention provides a kind of heterogeneous body consolidated core model with most permeable zone; it is clipped in the sandwich structure between two-layer hypothallus for one deck most permeable zone; wherein; described most permeable zone is mixed with by rock particles, epoxy resin, adjuvant and solid particle of sodium chloride and obtains, and described hypothallus is mixed with by rock particles, epoxy resin and adjuvant and obtains.
According to specific embodiment of the invention scheme, preferably, when preparing most permeable zone, the mass ratio of rock particles, epoxy resin, adjuvant and solid particle of sodium chloride is 100:5:1:50.
According to specific embodiment of the invention scheme, preferably, the rock particles adopted is natural sandstone particle.
According to specific embodiment of the invention scheme, preferably, the particle diameter of the rock particles adopted is according to the empirical relationship formula r=(0.6056 × e of permeability and rock particle diameter
ln (k)/ 1.30834) determine, r is particle diameter, and unit is μm, and k is permeability, and unit is mD.
According to specific embodiment of the invention scheme, preferably, this heterogeneous body consolidated core model improves the permeability of recovery ratio gel particle for measuring, and the particle diameter of the solid particle of sodium chloride adopted is not less than 1/3rd of gel particle particle diameter.
According to specific embodiment of the invention scheme, preferably, when preparing hypothallus, the mass ratio of rock particles, epoxy resin and adjuvant is 100:5:1.
According to specific embodiment of the invention scheme, preferably, the adjuvant adopted is hardening agent; More preferably, this hardening agent is diethylenetriamine.
Core model provided by the invention is cube shaped, it adopts natural core to be that material makes, in the middle part of rock core, form a wide-aperture most permeable zone, can special agent for improving oilfield recovery gel particle be evaluated by this core model with most permeable zone.
Present invention also offers the above-mentioned method for making with the heterogeneous body consolidated core model of most permeable zone, it comprises the following steps:
Natural core is smashed, grinds to form rock particles;
Solid sodium chloride is ground to form solid particle of sodium chloride;
Rock particles, epoxy resin and adjuvant are mixed, inserts in mould the hypothallus preparing reservation shape and size, smooth compacting;
Rock particles, epoxy resin, adjuvant and solid particle of sodium chloride are mixed, inserts the most permeable zone forming one deck reservation shape and size in mould on hypothallus, smooth compacting;
Rock particles, epoxy resin and adjuvant are mixed, inserts in mould another layer of hypothallus forming reservation shape and size on most permeable zone, form just base;
By compressing for first base (pressure of compacting is 1MPa, and the press time is 2 hours), then leaves standstill and be not less than 3 days, obtain the heterogeneous body consolidated core model with most permeable zone.
In above-mentioned preparation method, all can select according to the needs of reality for the thickness of hypothallus, most permeable zone, length and width equidimension.
Present invention also offers a kind of method measuring the permeability improving recovery ratio gel particle, it comprises the following steps:
Solid particle of sodium chloride is dissolved the above-mentioned saturated distilled water of heterogeneous body consolidated core model with most permeable zone;
Raising recovery ratio gel particle is injected described heterogeneous body consolidated core model, measures permeability.
The heterogeneous body consolidated core model with most permeable zone provided by the invention can solve the problem adopting conventional core not enter the note that slow swollen particle carries out evaluating existence, at the scene in Injection Well work progress, under certain injection pressure condition, pre-glue connection gel particle can inject the heterogeneous body consolidated core model with most permeable zone provided by the invention completely, thus realizes the evaluation of the oil reservoir applicability for pre-glue connection gel particle.
Accompanying drawing explanation
The structural representation with the heterogeneous body consolidated core model of most permeable zone that Fig. 1 provides for embodiment 1.
Embodiment
In order to there be understanding clearly to technical characteristic of the present invention, object and beneficial effect, existing following detailed description is carried out to technical scheme of the present invention, but can not be interpreted as to of the present invention can the restriction of practical range.
Embodiment 1
Present embodiments provide a kind of heterogeneous body consolidated core model with most permeable zone being applicable to the slow swollen particle seepage characteristic evaluating 0.2mm particle diameter, its method for making comprises the following steps:
1, determine slow swollen particle expand completely after particle diameter, the particle diameter of the slow swollen particle obtaining 0.2mm particle diameter by imbibition experiment after expansion is completely about 0.3mm;
2, statistical law display, aperture is not less than 1/3 of gel particle particle diameter, and gel particle can inject stratum under a certain pressure, therefore determines that the particle diameter of the solid particle of sodium chloride making most permeable zone is not less than 0.1mm;
3, suppose according to oil reservoir situation, need matrix permeability to be 3 darcies;
4, according to the empirical relationship formula r=(0.6056 × e of permeability and rock particle diameter
ln (k)/ 1.30834), calculating host rock grain diameter is 15 μm;
5, natural core crushed and grind, crossing 600 mesh sieves;
6, the natural core particle that 20kg crosses 600 mesh sieves is got, and the hardening agent mixing of the epoxy resin of 1kg and 0.2kg, fully stir;
7, insert in the mould of 50cm × 50cm × 5cm by the potpourri after the abundant stirring of step 5, thickness is 1.5cm, compacting, forms ground floor hypothallus;
8,20kg is crossed the natural core particle of 600 mesh sieves, 10kg crosses the solid particle of sodium chloride of 50 mesh sieves, the hardening agent mixing of the epoxy resin of 1kg and 0.2kg, insert in the mould of step 7 after fully stirring, thickness is 1.5cm, compacting, forms most permeable zone;
9, by step 6 preparating mixture, insert the most last layer of model, thickness is 1.5cm, forms second layer hypothallus, obtains the first base with sandwich structure;
10, first base is pressed, then leave standstill In Shade for mould until epoxy resin solidifies completely, model forming, obtain the core model with most permeable zone, its structure as shown in Figure 1, wherein, above one deck and below one deck be hypothallus 1, centre is most permeable zone 2, and two hypothalluses 1 and a most permeable zone 2 form sandwich structure.
Detection for the permeability improving recovery ratio gel particle can be carried out (experiment parameter can be determined according to actual conditions) according to following instance step:
1, model vacuumizes, saturated local water, measures permeability
The core model with most permeable zone prepared vacuumized, then saturated distilled water, NaCl particle is dissolved completely, inject distilled water and measure water phase permeability, the permeability recorded is 3000mD.
2, solution is configured
The polymer solution improving recovery ratio gel particle 10 grams (particle diameter 20 order) and concentration 1200ppm is mixedly configured into the solution of 5000ppm, leaves standstill 8 hours.
3, injection model
With the speed of 1ml/min, solution is injected core model 1 times of volume of voids, in injection process, first injection side pressure rise, rise to 20MPa gradually from 0MPa, and keep 5MPa to stablize, the pressure of two pressure taps in the middle part of model also rises to 3MPa and 1MPa subsequently and keeps stable;
In sequent water flooding process, injection side pressure slowly drops to 2.5MPa, and keeps stable, and the pressure of two pressure taps in the middle part of model also slowly drops to 1.5MPa and 0.5MPa subsequently and keeps stable.
4, resistance coefficient and residual resistance factor is calculated
The resistance coefficient of three sections of model is respectively: 20,20,10; Residual resistance factor is respectively: 10,10,5.
Embodiment 2
The present embodiment provides a kind of core model being applicable to the band most permeable zone of the slow swollen particle seepage characteristic evaluating 1mm particle diameter, and its method for making comprises the following steps:
1, determine slow swollen particle expand completely after particle diameter, the particle diameter of the slow swollen particle obtaining 1mm particle diameter by imbibition experiment after expansion is completely about 1.5mm;
2, statistical law display, aperture is not less than 1/3 of gel particle particle diameter, and gel particle can inject stratum under a certain pressure.Therefore determine that the particle diameter of the solid particle of sodium chloride making most permeable zone is not less than 0.5mm;
3, according to the reservoir geology situation of research, suppose that matrix permeability is 20 darcies;
4, according to the relation of permeability and pore size, calculating host rock grain diameter is 30 μm;
5, natural core crushed and grind, crossing 400 mesh sieves;
6, the natural core particle that 5kg crosses 400 mesh sieves is got, and the hardening agent mixing of the epoxy resin of 0.2kg and 0.1kg, fully stir;
7, insert in the mould of 50cm × 50cm × 5cm by the potpourri after the abundant stirring of step 6, thickness is 1.5cm, compacting, forms ground floor hypothallus;
8,1.5kg is crossed the natural core particle of 400 mesh sieves, 3.5kg crosses the solid particle of sodium chloride of 30 mesh sieves, the hardening agent mixing of the epoxy resin of 0.2kg and 0.1kg, insert in step 7 mould after fully stirring, thickness is 1.5cm, compacting, forms most permeable zone;
9, by step 6 preparating mixture, insert the most last layer of model, thickness is 1.5cm, forms second time hypothallus, obtains the first base with sandwich structure;
10, be pressed to first base, then leave standstill In Shade for mould until epoxy resin solidifies completely, model forming, obtains the core model with most permeable zone.
Detection for the permeability improving recovery ratio gel particle can be carried out (experiment parameter can be determined according to actual conditions) according to following instance step:
1, model vacuumizes, saturated local water, measures permeability
The core model with most permeable zone prepared vacuumized, then saturated distilled water, NaCl particle is dissolved completely, inject distilled water and measure water phase permeability, the permeability recorded is 3500mD.
2, solution is configured
The polymer solution improving recovery ratio gel particle 10 grams (particle diameter 80 order) and concentration 1200ppm is mixedly configured into the solution of 5000ppm, leaves standstill 8 hours.
3, injection model
With the speed of 1ml/min, solution is injected core model 1 times of volume of voids, in injection process, first injection side pressure rise, rise to 15MPa gradually from 0MPa, and keep 15MPa to stablize, the pressure of two pressure taps in the middle part of model also rises to 10MPa and 5MPa subsequently and keeps stable;
In sequent water flooding process, injection side pressure slowly drops to 7.5MPa, and keeps stable, and the pressure of two pressure taps in the middle part of model also slowly drops to 5MPa and 2.5MPa subsequently and keeps stable.
4, resistance coefficient and residual resistance factor is calculated
The resistance coefficient of three sections of model is respectively: 50,50,50; Residual resistance factor is respectively: 25,25,25.
Claims (13)
1. one kind has the heterogeneous body consolidated core model of most permeable zone; it is clipped in the sandwich structure between two-layer hypothallus for one deck most permeable zone; wherein; described most permeable zone is mixed with by rock particles, epoxy resin, adjuvant and solid particle of sodium chloride and obtains, and described hypothallus is mixed with by rock particles, epoxy resin and adjuvant and obtains.
2. heterogeneous body consolidated core model according to claim 1, wherein, the mass ratio preparing the rock particles of most permeable zone, epoxy resin, adjuvant and solid particle of sodium chloride is 100:5:1:50.
3. heterogeneous body consolidated core model according to claim 1 and 2, wherein, described rock particles is natural sandstone particle.
4. heterogeneous body consolidated core model according to claim 1, wherein, the particle diameter of described rock particles is according to the empirical relationship formula r=(0.6056 × e of permeability and rock particle diameter
ln (k)/ 1.30834) determine, r is particle diameter, and unit is μm, and k is permeability, and unit is mD.
5. heterogeneous body consolidated core model according to claim 3, wherein, the particle diameter of described rock particles is according to the empirical relationship formula r=(0.6056 × e of permeability and rock particle diameter
ln (k)/ 1.30834) determine, r is particle diameter, and unit is μm, and k is permeability, and unit is mD.
6. heterogeneous body consolidated core model according to claim 1 and 2, wherein, this heterogeneous body consolidated core model improves the permeability of recovery ratio gel particle for measuring, and the particle diameter of described solid particle of sodium chloride is not less than 1/3rd of gel particle particle diameter.
7. heterogeneous body consolidated core model according to claim 1 and 2, wherein, the mass ratio preparing the rock particles of hypothallus, epoxy resin and adjuvant is 100:5:1.
8. heterogeneous body consolidated core model according to claim 1 and 2, wherein, described adjuvant is hardening agent.
9. heterogeneous body consolidated core model according to claim 7, wherein, described adjuvant is hardening agent.
10. heterogeneous body consolidated core model according to claim 8, wherein, described hardening agent is diethylenetriamine.
11. heterogeneous body consolidated core models according to claim 9, wherein, described hardening agent is diethylenetriamine.
The method for making with the heterogeneous body consolidated core model of most permeable zone described in 12. any one of claim 1-11, it comprises the following steps:
Natural core is smashed, grinds to form rock particles;
Solid sodium chloride is ground to form solid particle of sodium chloride;
Rock particles, epoxy resin and adjuvant are mixed, inserts in mould the hypothallus preparing reservation shape and size, smooth compacting;
Rock particles, epoxy resin, adjuvant and solid particle of sodium chloride are mixed, inserts the most permeable zone forming one deck reservation shape and size in mould on hypothallus, smooth compacting;
Rock particles, epoxy resin and adjuvant are mixed, inserts in mould another layer of hypothallus forming reservation shape and size on most permeable zone, obtain just base;
By compressing for described first base, the pressure of compacting is 1MPa, and the press time is 2 hours, then leaves standstill and is no less than 3 days, have the heterogeneous body consolidated core model of most permeable zone described in obtaining.
13. 1 kinds of methods measuring the permeability improving recovery ratio gel particle, it comprises the following steps:
Solid particle of sodium chloride is dissolved the saturated distilled water of heterogeneous body consolidated core model with most permeable zone described in any one of claim 1-11;
Raising recovery ratio gel particle is injected described heterogeneous body consolidated core model, measures permeability.
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| CN103643929A (en) * | 2013-12-03 | 2014-03-19 | 中国石油大学(北京) | Asphalt particle profile control effect predicting device and method for three-dimensional cementation model |
| CN103994959A (en) * | 2014-05-13 | 2014-08-20 | 中国石油天然气股份有限公司 | Method for evaluating adaptability of gel microsphere profile control agent to oil reservoir |
| CN103993876B (en) * | 2014-05-13 | 2016-07-06 | 中国石油天然气股份有限公司 | A kind of method evaluating slow swollen granule oil reservoir conformability |
| CN104634629B (en) * | 2015-01-16 | 2018-05-18 | 中国矿业大学 | Preparation and sampling method for the rocks sample of compound rock stratum analog simulation |
| CN108548702B (en) * | 2018-03-10 | 2020-09-22 | 东北石油大学 | Preparation blank of matrix-hypertonic strip rock core and rock core preparation method |
| CN114459841B (en) * | 2020-11-09 | 2023-09-26 | 中国石油天然气股份有限公司 | Heterogeneous core model and preparation method thereof |
| CN112857935B (en) * | 2021-01-22 | 2022-11-18 | 上海大学 | Preparation method of large-grade-difference heterogeneous nonmagnetic core |
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